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6 Mar 2000

Volume 76, Issue 10, pp. 1219-1345

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Molecular detection based on conductance quantization of nanowires

C. Z. Li, H. X. He, A. Bogozi, J. S. Bunch, and N. J. Tao

Appl. Phys. Lett. 76, 1333 (2000); http://dx.doi.org/10.1063/1.126025 (3 pages) | Cited 75 times

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We have studied molecular adsorption onto stable metallic nanowires fabricated with an electrochemical method. Upon the adsorption, the quantized conductance decreases, typically, to a fractional value, which may be attributed to the scattering of the conduction electrons by the adsorbates. The further conductance change occurs when the nanowire is exposed to another molecule that has stronger adsorption strength. Because the quantized conductance is determined by a few atoms at the narrowest portion of each nanowire, adsorption of a molecule onto the portion is enough to change the conductance, which may be used for chemical sensors. © 2000 American Institute of Physics.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
73.61.At Metal and metallic alloys
68.03.Fg Evaporation and condensation of liquids
68.43.Mn Adsorption kinetics
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
73.25.+i Surface conductivity and carrier phenomena
73.23.-b Electronic transport in mesoscopic systems
82.45.-h Electrochemistry and electrophoresis
72.15.Qm Scattering mechanisms and Kondo effect

Direct measurement of internal potential distribution in organic electroluminescent diodes during operation

Masahiro Hiramoto, Keiji Koyama, Ken-ichi Nakayama, and Masaaki Yokoyama

Appl. Phys. Lett. 76, 1336 (2000); http://dx.doi.org/10.1063/1.126026 (3 pages) | Cited 18 times

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Direct measurement of the internal potential distribution in an organic electroluminescent (EL) diode under operating conditions was carried out by inserting a third gold electrode in the bulk of the organic thin film to monitor the potential. This electrode was sandwiched between two driving metal electrodes. During the operation of the organic EL diode, consisting of hole transporting and emitter layers, the applied voltage was distributed mainly across the emitter layer. The present technique provides a useful method for elucidating the operating mechanism of various types of organic thin-film devices. © 2000 American Institute of Physics.
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85.60.Jb Light-emitting devices

High anisotropic conductivity in organic insulator/semiconductor monolayer heterostructure

J. Collet, S. Lenfant, D. Vuillaume, O. Bouloussa, F. Rondelez, J. M. Gay, K. Kham, and C. Chevrot

Appl. Phys. Lett. 76, 1339 (2000); http://dx.doi.org/10.1063/1.126027 (3 pages) | Cited 17 times

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We demonstrate a highly anisotropic conductivity, with a 109 ratio, between the in-plane and perpendicular electrical transport in organic insulator/semiconductor heterostructures of monolayer thickness. These heterostructures are self-assembled monolayers made of alkyl chains and functionalized by various conjugated moieties at their ends. The high anisotropic conductivity is due to the close packing of the conjugated end groups. These structures might be the building blocks of molecular-scale devices. © 2000 American Institute of Physics.
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73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
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